Improve PDF reader items observer #1027
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Improves lag reported in forum post
For the items observer in PDF reader, filters with
keyPathforchangeTypeproperty, to only observe modifications of those annotations with a modified change type. Otherwise, every annotation insertion would also trigger after sync an observed update of all annotations modified.Since the observer runs on the main thread there is a noticeable lag with a large number of annotations (I tested with over 1000). There is room for future improvements regarding this edge case.